JPH0418344Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a Guyangmoor.

(Prior Art) For example, in a gigantic mower equipped with three reel mowers, a pair of front reel mowers are placed on both the left and right sides of the tractor body in a working position in which they extend approximately horizontally outward from the vehicle body, and in a working position that extends approximately horizontally along the vehicle body. A rear reel mower is provided at the rear of the vehicle body so that it can be freely raised and lowered, and the reel mower has a cutting reel and a hydraulic motor that rotationally drives the reel. Equipped with a hydraulic pump that supplies hydraulic oil to a hydraulic motor (e.g.
(See Utility Model Application Publication No. 1983-67034 and Utility Model Application Publication No. 60-67033).

In the conventional type, the rear reel mower is rotatable around the axis in the front-rear direction, so when the rear reel mower is raised, a stopper device is provided to prevent the mower from rotating (for example, in actual use). (Refer to Publication No. 192509 of 1983).

The stopper device described in the above-mentioned Japanese Utility Model Publication No. 58-192509 has guide rollers protruding from the tractor side so as to correspond to the left and right upper surfaces of the rear reel mower when the rear reel mower is raised. , the vertical position of the guide roller was adjustable.

(Problem to be solved by the invention) The conventional stopper device is mainly used to prevent the mower from tilting significantly when the mower is raised and travels on the road, and is not useful unless the mower is raised to a predetermined height. It was something I didn't have.

That is, when mowing the lawn with the mower at a golf course, etc., the other surface below the mower is steeply inclined, and the mower may be inclined steeply. It was not possible to prevent the mower from tilting excessively.

In order to prevent such steep inclination during work, it is necessary to adjust the protrusion length of the stopper device.

That is, in working conditions and on-road driving conditions,
Each time, the length of the stopper device must be adjusted, and this adjustment requires getting off the tractor, which is very troublesome.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a gigantic mower equipped with a stopper device that is always activated both during work and when traveling on the road.

(Means for Solving the Problems) In order to achieve the above object, the present invention takes the following measures. In other words, the features of the present invention are that the front reel mower is attached to the side of the tractor body in a working position in which it extends approximately horizontally to the outside of the vehicle body, and in a storage position in which it is held approximately vertically along the vehicle body. The rear reel mower is equipped with a rear reel mower at the rear of the vehicle body, and these reel mowers have a cutting reel and a hydraulic motor that rotates the reel.A hydraulic pump is installed on the vehicle body to supply hydraulic oil to the hydraulic motor. In the gearing mower equipped with the above-mentioned gear mower, a three-point link mechanism is provided at the rear of the vehicle body so as to be able to move up and down, and the three-point link mechanism has a triangular shape in front view, which is made up of a pair of left and right side plates and a connecting plate that connects the lower ends of the side plates. A frame body is provided in a detachable manner, and a support shaft in the front and rear direction is provided in the center portion of the connecting plate in the left and right direction, and an upright portion provided upright in the center portion in the left and right direction of the rear reel mower is rotated on the support shaft. The lower end edge of the side plate is formed as a stopper surface against which the upper surface of the rear reel mower comes into contact to prevent rotation when the rear reel mower rotates around the spindle. It is in.

(Function) According to the present invention, the rear reel mower is rotatable around the support shaft relative to the vehicle body, so even if the slope of the ground where the vehicle body is located differs from the slope of the ground where the rear reel mower is located. The rear reel mower can rotate independently of the inclination of the vehicle body, improving ground tracking performance.

Furthermore, the rear reel mower is attached to the frame,
Since the lower surface of the side plate of the frame is formed on the stopper surface, the height relationship between the stopper surface and the reel mower does not change even when the frame is moved up and down by the three-point link mechanism. Therefore, the rear reel mower is prevented from rotating beyond a certain angle, whether in a lowered working state or an elevated road running state.

(Embodiment) Hereinafter, an embodiment in which the present invention is applied to a gigang mower equipped with three reel mowers will be described based on the drawings. It has a front reel mower 2 and a rear reel mower 3.

Reference numeral 4 denotes a tractor body, which includes an engine 5, a transmission case 6, a front axle frame 7, etc., and the front axle frame 7 projects forward from the engine 5.

Reference numeral 8 denotes a hydraulic system for lifting and lowering the working machine, which is mounted on the rear part of the transmission case 6 and has a pair of left and right lift arms 9.

10 is a bonnet that covers the engine 5, etc.;
1 is a steering wheel, 12 is a rear wheel, 14 is a rear wheel fender, and 15 is a seat.

Reference numeral 16 denotes a pair of left and right steps that protrude outward from the middle part of the mission case 6 in the front-rear direction.

The reel mowers 2 and 3 include a machine frame 17, a cutting reel 18, a hydraulic motor 19, a cover 20,
It has front and rear rollers 21, 22, etc.

The cutting reel 18 is arranged in the longitudinal direction of the reel mowers 2 and 3 at the center in the front-rear direction, that is, in the left-right direction, and is covered with a cover 20.

The hydraulic motor 19 is disposed above the cover 20 and rotates the reel 18 via the winding transmission mechanism 24, and is provided at the longitudinal end of the left and right front reel mowers 2.

In addition, in the rear reel mower 3, the hydraulic motor 19
is provided on the left end.

The left and right front reel mowers 2 are provided between the front and rear wheels 12 and 13 of the vehicle body 1 in the following manner.

That is, a pair of brackets 26 are fixed to both left and right side surfaces of the central portion in the longitudinal direction of the vehicle body 1 in an outwardly projecting manner, and both the left and right brackets 26 are connected by front and rear connecting members 27 and 28.

An arm 29 is rotatably supported at the outer end of each bracket 26 by a support shaft 30 in the front-rear direction.
A lift cylinder 31 for rotating each arm 29 is interposed between the base of each arm 29 and the front connecting member 27, and the arm 29 is connected to the reel mower 2.
Located diagonally above and in front of.

An arm 2 is provided in the machine frame 17 in an upright manner at the center in the left and right direction of the front part of the front reel mower 2.
An upright portion 23 is provided at the rear of the arm 29, and the upper end of the upright portion 23 is rotatably supported by a support shaft 32 in the front-rear direction at the tip of the arm 29. By rotating the reel mower 2, the front reel mower 2 follows the slope of the ground.

Then, by the operation of the lift cylinder 31, the front reel mower 2 is placed in a working position in which it is horizontally extended outward from the vehicle body 4, as shown in the right part of FIG. In addition, the posture can be freely changed between a vertical posture along the vehicle body 4 and a stowed posture.

A stopper 33 is provided on the lower surface side of the arm 29 to bring the front reel mower 2 into a vertical position by coming into contact with the machine frame 17 or the cover 20 when the front reel mower 2 is placed in the storage position.

Further, the rear reel mower 3 is attached to the rear of the vehicle body 4 via a three-point link mechanism 34 and a frame 35 so as to be able to move up and down and be detachably attached.

The three-point link mechanism 34 includes a top link 56 at the center and a pair of left and right lower links 57.
58 is a lift rod.

As shown in FIG. 4, the frame body 35 has a triangular shape when viewed from the front and is composed of a pair of left and right side plates 59 and a pair of front and rear connecting plates 60 that connect the lower ends of the side plates 59.

The lower end edge of the side plate 59 is a stopper surface 61 that is curved upwardly, and each lower link 57 is detachably connected to the lower end of the side plate 59 via a mounting pin 63.

The vertically intermediate portion of the side plate 59 has an inclined shape that moves inward as it goes upward, and a top link 56 is detachably connected between the upper ends of both side plates 59 by a mounting pin 62.

The machine frame 17 of the rear reel mower 3 includes cylindrical upper and lower horizontal members 65 and 66 installed horizontally in the left-right direction, and a pair of left and right connecting plates 67 that connect the outer ends of both horizontal members 65 and 66. , has an upright portion 68 erected at the center in the left-right direction of the upper horizontal member 65, and these are disposed at the front portion of the rear reel mower 3.

The upper end of the upright portion 68 is connected to the front and rear connecting plate 6 of the frame body 35.
0, and a support shaft 69 is inserted therein so as to be freely insertable and removable in the front-rear direction, whereby the rear reel mower 3 is removably connected to the frame 35.

Furthermore, the rear reel mower 3 is rotatable around the support shaft 69 so as to follow the slope of the ground well, but as shown by the imaginary line in FIG. The horizontal member 65 is the side plate 5 of the frame body 35
By contacting the stopper surface 9 with 61, rotation of the rear reel mower 3 beyond a predetermined value is prevented.

Next, the hydraulic drive system of the reel mowers 2 and 3 will be explained with reference to FIG.
is equipped with an oil tank 37, a second oil cleaner 38, and an oil cooler 39.

Reference numeral 40 denotes a hydraulic pump, which is attached to the front surface of the front axle frame 7 so as to project forward, and is rotationally driven by a PTO shaft which projects forward from the engine 5. A first oil cleaner 41 is provided on the right side of the hydraulic pump 40.

Reference numeral 42 denotes a hydraulic control valve, which is a 6-port, 3-position switching valve, and is used to operate the reel 18 of each reel mower 2, 3 in forward, reverse, and stop directions. 43, and controls the hydraulic oil discharged from the hydraulic pump 40. 44 is a control lever.

45 is a block-shaped hydraulic oil supply body;
Several oil passages are formed and connected to the control valve 42 and each hydraulic motor 19, and the hydraulic oil discharged from the control valve 42 is sent from the supply body 45 to the hydraulic motor 19 of the right front reel mower 2 and the hydraulic oil supplied thereto. body 45, hydraulic motor 19 of left front reel mower 2, supply body 4
5, via the rear reel mower 3 and the supply body 45,
Alternatively, it is returned to the control valve 42 through a route opposite to that described above.

The supply body 45 is disposed below between the left and right front reel mowers 2 of the vehicle body 4 and is attached to the vehicle body 4, and is located at the same position in the longitudinal direction as the hydraulic motor 19 of the left and right front reel mowers 2. There is.

A pair of left and right front switching valves 46 are interposed between the supply body 45 and the hydraulic motor 19 of each front reel mower 2.

The front switching valve 46 is a 3-port 2-position switching valve, and can be freely switched between two positions: a supply position for supplying hydraulic oil to the hydraulic motor 19 and a stop position for stopping the supply of hydraulic oil to the hydraulic motor 19. It is biased toward the supply position by a spring 47, and has an operating body 48 for switching the front switching valve 46 to the stop position.

The front switching valve 46 is attached to the upper surface of the cover 20 and is located at the longitudinal base of the front reel mower 2 and at the center in the front and back direction, and is at the same position as the hydraulic motor 19 and the supply body 45 in the front and back direction, The front switching valve 46, the hydraulic motor 19, and the supply body 45 are
In plan view, they are arranged in parallel on a straight line in the left and right direction.

Each front switching valve 46 is connected to each hydraulic motor 19 and piping 4 such as a hydraulic pipe or hydraulic hose passing above the cover 20.
9, and at least a part of the piping 50 between each front switching valve 46 and the supply body 45 is constituted by a flexible hydraulic hose so as to be able to respond to changes in the attitude of the front reel mower 2. There is.

The left and right steps 16 are the front switching valves 46.
As shown in the left part of FIG. 3, the operating body 48 of the front switching valve 46 comes into contact with the step 16 toward the end when the front reel mower 2 is in the storage position, and the front When the front reel mower 2 is in the storage position or in the previous position, the front switching valve 46 is at the stop position.

Further, a rear switching valve 51 is also interposed between the supply body 45 and the hydraulic motor 19 of the rear reel mower 3, and is arranged in parallel with the hydraulic control valve 42.

The rear switching valve 51 is a 4-port 2-position switching valve and has two positions: a supply position for supplying hydraulic oil to the hydraulic motor 19 and a stop position for stopping the hydraulic oil supply. Be manipulated.

The rear switching valve 51 and the hydraulic motor 19 of the rear reel mower 3 are separably connected via self-seal type quick-release couplers 53, 54, etc., and the coupler 53 on the rear switching valve 51 side is connected to a mounting base. 72, and is disposed at an appropriate location such as the rear side surface of the mission case 6.

73 and 74 are piping, and the piping 74 of the rear reel mower 3 is composed of a flexible hydraulic hose or the like.

According to the embodiment configured as described above, during work, the left and right front reel mowers 2 are in the working posture, as shown in the right part of FIG. 3, and the front switching valve 46 is set to the supply position by the spring 47. At the same time, the rear reel mower 3 is also placed in a lowered position and in a working position. In this state, hydraulic oil is supplied from the hydraulic control valve 42 to the supply body 45, and the rear switching valve 51 is placed in the supply position.

As a result, hydraulic oil can be supplied to the hydraulic motors 19 of each reel mower 2, 3, and each reel 18 can be rotationally driven, and in this state, mowing work can be performed by moving the gigantic mower forward.

When changing the left and right front reel mowers 2 from the working position to the storage position, the lift cylinders 31
This causes arm 2 to operate.
9 rotates upward, the front reel mower 2 rotates around the support shaft 32 and comes into contact with the stopper 33, and assumes the storage position as shown on the left side of FIG. 3.

Then, at the end of the above posture change, the operating body 48 of the front switching valve 46 comes into contact with the step 16 and is pushed in, and the front switching valve 46 comes to the stop position.

As a result, the supply of hydraulic oil to the hydraulic motor 19 of the front reel mower 2 is stopped, the reel 18 is stopped, and safety is ensured.

In addition, when other work equipment is attached to the rear of the vehicle body 4 to perform work other than mowing, the hydraulic control valve 42 and the rear switching valve 51 are set to the stop position, and the front reel mower 2 is moved as described above. The storage position is as follows.

Then, the couplers 53 and 54 are disconnected, and the frame 35 and rear reel mower 3 are removed from the three-point link mechanism 34.

Next, by attaching a suitable working machine to the three-point linkage mechanism 34 and driving the tractor 1, it is possible to easily perform other work other than mowing the grass using the working machine.

Incidentally, the present invention is also applicable to a gigantic mower having five reel mowers.

(Effects of the invention) As described in detail above, according to the invention, the rear reel mower is provided in the frame so that it can freely rotate around the support shaft in the front and back direction, so during grass mowing work, the rear reel mower can be moved around the support shaft. The rotation of the rear reel mower allows it to follow the slope of the ground well, and even though the rear reel mower is removably attached to the vehicle body via a three-point linkage mechanism or frame, etc., the rear reel mower Mowing work can be done well. According to the present invention, the lower surface of the side plate of the frame body is formed as a stopper surface, so even if the frame body is held at an arbitrary height by the three-point link mechanism, it will always meet the stopper surface of the lower edge of the side plate. The distance from the upper surface of the rear reel mower is kept constant, so that excessive inclination of the rear reel mower can be prevented both in working conditions and when traveling on the road. The present invention has the above advantages and is of great practical benefit.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a plan view, and Fig. 3 is a rear view.
FIG. 4 is a front view of main parts, and FIG. 5 is a hydraulic circuit diagram. DESCRIPTION OF SYMBOLS 1... Tractor, 2, 3... Front/rear reel mower, 4... Tractor body, 18... Cutting reel, 19... Hydraulic motor, 34... Three-point link mechanism, 35... Frame, 40 ...Hydraulic pump, 42
... Hydraulic control valve, 46, 51 ... Front/rear switching valve, 53, 54 ... Coupler, 69 ... Support shaft.

Claims (1)

[Scope of claim for utility model registration] Front reel mower 2 on the side of the tractor body 4
is equipped with a rear reel mower 3 at the rear of the vehicle body 4, and a rear reel mower 3 is provided at the rear of the vehicle body 4. Each reel mower 2,3
However, in a gigantic mower having a cutting reel 18, a hydraulic motor 19 for rotationally driving the reel 18, etc., and a hydraulic pump 40 for supplying hydraulic oil to the hydraulic motor 19 on the car body 4, the following is provided at the rear of the car body 4. A three-point link mechanism 34 is provided that can be raised and lowered, and a pair of left and right side plates 59 are attached to the three-point link mechanism 34.
and a connecting plate 60 connecting the lower ends of the side plates 59, the frame body 35 has a triangular shape when viewed from the front and can be attached and detached, and the connecting plate 60 has a support shaft 69 in the front-rear direction at the center in the left-right direction. An upright portion 68 erected at the center in the left-right direction of the rear reel mower 3 is rotatably connected to the support shaft 69, and a lower end edge of the side plate 59 allows the rear reel mower 3 to rotate around the support shaft 69. A gigantic mower characterized in that a stopper surface 61 is formed on which the upper surface of the rear reel mower 3 comes into contact to prevent rotation when the rear reel mower 3 rotates.